When the final gun of Sunday’s Super Bowl was fired, it signaled not only the official completion of Kurt Warner’s fairy tale NFL season, but the unofficial start of the Warner marketing sweepstakes.

Mark Bartlestein, Warner’s agent told The Post he fielded more than 20 calls from potential marketing partners as of lunchtime yesterday and expected dozens more to pour in. Book and movie deals have already been proposed, he said.

“It’s been an unbelievable couple of months and it’s just escalated,” the Chicago-based Bartlestein noted. “There are certainly more and more believers in the Kurt Warner story.”

The 28-year old rookie’s story is well known. Cut from the NFL, he went to work — first as a $5.50 an hour supermarket clerk. He tried to play in the Canadian league but was cut there, too. Refusing to quit, he moved to the Arena Football League for three years before playing his way into a tryout with the NFL’s European league.

After a good year abroad, Warner won a contract as a backup quarterback with the Rams for the NFL minimum salary of $250,000. An injury to the starting quarterback pushed Warner into the spotlight, and the rest is history. He won this regular season’s MVP and the Super Bowl MVP.

Already, Warner, 28, has inked regional endorsement deals for a candy bar and a cereal and recently shot one of those milk mustache ads. The “I’m Going to Disney World” ad was shot after the game Sunday.